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SubjectRe: Filesystem Corruption (ext2) on Tyan S2462, 2xAMD1900MP, 2.4.17SMP (RH7.2)
On Wed, Mar 20, 2002 at 01:31:46AM +0000, Alan Cox wrote:
> > We're seeing this with Tyan 2410s and Seagate drives. I think Tyan just
> > can't get DMA right. Luckily we mainly lost docs or man pages before we
> > disabled DMA, although losing the rpm database sucked. MDMA2 seems okay
> > but we haven't tested it long enough to form a lasting impression.
> > I'm actually patching the ServerWorks driver to honor the CONFIG flag,
> > since even with hdparm there is a narrow risk to the fs during the boot
> > process before DMA is disabled.
> I can confirm problems with serverworks OSB4 and UDMA. With UDMA and
> a seagate disk you see 4 bytes repeat from one transfer into the next
> shuffling all the data up 4 bytes (which since it includes inode and
> metadata is *messy*). Current 2.4 has detect code that sometimes traps this
> and panics to avoid fs death.
>
> With MWDMA all was fine.
>
> This was observed across a large number of boxes in a rendering farm so its
> not a one off flawed box, and across two board vendors. I reported it to
> serverworks who were interested but couldnt reproduce it in their lab.

It seems like Daniela Engert found this problem too:

--------------------------------------------------------------------------------
Vendor
| Device
| | Revision ATA ATAPI ATA66 ATA133
| | | south/host bridge id PIO DMA PIO DMA ATA33 | ATA100| Docs
| | | | south/host bridge rev. 32bit | 32bit | | | | | avail
| | | | | | | | | | | | | |
v v v v v v v v v v v v v v
0x1166 ServerWorks
0x0211 OSB4 x x ? ? x - - - x
0x0212 CSB5
< 0x92 x x ? ? x x - - -
>= 0x92 x x ? ? x x x - -

known bugs:
- OSB4: at least some chip revisions can't do Ultra DMA mode 1 and above
- CSB5: no host side cable type detection.

--------------------------------------------------------------------------------

--
Vojtech Pavlik
SuSE Labs
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